[Your address and contact number]
[Warranty provider's address]
[Reference: warranty number]
I write in relation to the above warranty.
On [dd/mm/yy], I purchased [details] extended warranty from [add details] for the sum of [£xx].
I have decided that I wish to cancel the warranty and am cancelling within 45 days of purchasing it.
The Supply of Extended Warranties on Domestic Electrical Goods Order 2005 states that I am entitled to a full refund without any deductions.
I look forward to hearing from you and receiving the full refund within the next 14 days from the date of my letter.